DNA is fundamental to the biology of all life on Earth, but how many of us actually know what it is or what it's made of?

Each nucleotide has an affinity for its partner. A pairs with T, and C pairs with G. This page has been archived and is no longer updated . Each nucleotide has an affinity for its partner.

Each codon codes for one specific amino acid. The genetic code is a set of instructions that direct the translation of DNA into 20 amino acids, the basic units of proteins in living cells.

Each nucleotide has an affinity for its partner. A pairs with T, and C pairs with G.